diff options
Diffstat (limited to 'src/backend/utils/cache/catcache.c')
| -rw-r--r-- | src/backend/utils/cache/catcache.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c index acd0518748d..ea3daa599ca 100644 --- a/src/backend/utils/cache/catcache.c +++ b/src/backend/utils/cache/catcache.c @@ -1282,6 +1282,46 @@ ReleaseCatCache(HeapTuple tuple) /* + * GetCatCacheHashValue + * + * Compute the hash value for a given set of search keys. + * + * The reason for exposing this as part of the API is that the hash value is + * exposed in cache invalidation operations, so there are places outside the + * catcache code that need to be able to compute the hash values. + */ +uint32 +GetCatCacheHashValue(CatCache *cache, + Datum v1, + Datum v2, + Datum v3, + Datum v4) +{ + ScanKeyData cur_skey[CATCACHE_MAXKEYS]; + + /* + * one-time startup overhead for each cache + */ + if (cache->cc_tupdesc == NULL) + CatalogCacheInitializeCache(cache); + + /* + * initialize the search key information + */ + memcpy(cur_skey, cache->cc_skey, sizeof(cur_skey)); + cur_skey[0].sk_argument = v1; + cur_skey[1].sk_argument = v2; + cur_skey[2].sk_argument = v3; + cur_skey[3].sk_argument = v4; + + /* + * calculate the hash value + */ + return CatalogCacheComputeHashValue(cache, cache->cc_nkeys, cur_skey); +} + + +/* * SearchCatCacheList * * Generate a list of all tuples matching a partial key (that is, |